field_mappings.rs

macro_rules! code_value_enum {
    (
        $NAME:ident {
            $(
                $VARIANT:ident => $OUT:expr; {
                    <= $( $IN:pat )|+
                }
            ),*
        }
    ) => (
        #[derive(Clone, Copy, Debug)]
        pub enum $NAME {
            $(
                $VARIANT,
            )*
        }

        impl CodeValue for $NAME {
        	fn value(&self) -> &str {
        		match *self {
        		    $(
        		        $NAME::$VARIANT => $OUT,
        		    )*
        		}
        	}

        	fn from_value(value: &str) -> $NAME {
        		match value {
        		    $(
        		        $(
        		            $IN
        		        )|+ => $NAME::$VARIANT,
        		    )*
        		}
        	}
        }
    );
}

code_value_enum! {
	PatientSex {
		Male => "Male"; {
			<= "M" | "Male"
		},
		Female => "Female"; {
			<= "F" | "Female"
		},
		Missing => "Missing"; {
			<= ""
		},
		Unknown => "Unknown"; {
			<= _
		}
	}
}